AN3329 datasheet(22/47 Pages) STMICROELECTRONICS

Part #	AN3329

Description	This application note describes the characteristics and features

PDF	47 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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22 / 47 page

Functional check

AN3329

22/47

Doc ID 18376 Rev 1

Figure 39.

Output rectifiers PIV waveforms

No load operation

In Figure 40 and 41 operation at no load is shown. This check has been done for reference

only, as typically a TV SMPS never works in such conditions. As seen, PFC is working in

burst-mode, while the resonant stage is operating in continuous switching. This is possible

by connecting the standby pin to the RFmin pin and it has been done to avoid any possible

interference between the resonant stage and the TV circuitry. In Figure 41 the half bridge

maximum operating switching frequency is measured.

CH2: D11 anode voltage

CH3: D9A anode voltage

CH4: D9B anode voltage

CH1: D4 anode voltage

Figure 40.

No load operation at 115 Vac - 60 Hz Figure 41.

No load operation at 115 Vac - 60 Hz

- L6599A signals

CH4: PFC drain voltage

CH1: HB voltage

CH3: Standby (pin #5)

CH1: HB voltage

CH2: CF (pin #3)

AN3329 Datasheet(PDF) 22 Page - STMicroelectronics